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feerate.h
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Copyright (c) 2017-2019 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_FEERATE_H
#define BITCOIN_FEERATE_H
#include <amount.h>
#include <serialize.h>
#include <cstdlib>
#include <ostream>
#include <string>
#include <type_traits>
/**
* Fee rate in satoshis per kilobyte: Amount / kB
*/
class CFeeRate {
private:
// unit is satoshis-per-1,000-bytes
Amount nSatoshisPerK;
public:
/**
* Fee rate of 0 satoshis per kB.
*/
constexpr CFeeRate() : nSatoshisPerK() {}
explicit constexpr CFeeRate(const Amount _nSatoshisPerK)
: nSatoshisPerK(_nSatoshisPerK) {}
/**
* Constructor for a fee rate in satoshis per kB. The size in bytes must not
* exceed (2^63 - 1)
*/
CFeeRate(const Amount nFeePaid, size_t nBytes);
/**
* Return the fee in satoshis for the given size in bytes.
*/
Amount GetFee(size_t nBytes) const;
/**
* Return the ceiling of a fee calculation in satoshis for the given size in
* bytes.
*/
Amount GetFeeCeiling(size_t nBytes) const;
/**
* Return the fee in satoshis for a size of 1000 bytes
*/
Amount GetFeePerK() const { return GetFee(1000); }
/**
* Equality
*/
friend constexpr bool operator==(const CFeeRate a, const CFeeRate b) {
return a.nSatoshisPerK == b.nSatoshisPerK;
}
friend constexpr bool operator!=(const CFeeRate a, const CFeeRate b) {
return !(a == b);
}
/**
* Comparison
*/
friend bool operator<(const CFeeRate &a, const CFeeRate &b) {
return a.nSatoshisPerK < b.nSatoshisPerK;
}
friend bool operator>(const CFeeRate &a, const CFeeRate &b) {
return a.nSatoshisPerK > b.nSatoshisPerK;
}
friend bool operator<=(const CFeeRate &a, const CFeeRate &b) {
return a.nSatoshisPerK <= b.nSatoshisPerK;
}
friend bool operator>=(const CFeeRate &a, const CFeeRate &b) {
return a.nSatoshisPerK >= b.nSatoshisPerK;
}
CFeeRate &operator+=(const CFeeRate &a) {
nSatoshisPerK += a.nSatoshisPerK;
return *this;
}
std::string ToString() const;
SERIALIZE_METHODS(CFeeRate, obj) { READWRITE(obj.nSatoshisPerK); }
};
#endif // BITCOIN_FEERATE_H

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